Valve body forging method

Abstract

The invention relates to the field of valve body manufacturing, in particular to a valve body forging method. The valve body forging method saves materials and energy and reduces consumption on the condition of meeting the requirement of customers for product diversification. At first, blank forming is achieved by utilizing free forging for executing the following steps of A, selecting round steel with the weight being 1.15-1.25 times the weight of a finished valve body, riveting the two ends of the round steel, conducting indentation material separation, and forging the round steel into the preset size; B, enabling the two ends of the round steel to get off a table, forging eccentricity of the middle and the two ends, and forging the two ends into 260-degree octagons; C, then utilizing pressing blocks for making octagonal pressure grooves in the two ends into the preset size, and ensuring that flanges and grooves of a green body are within the design size range. Then, final forming is achieved by adopting semi-die forging for executing the following steps of a, forging the middle octagon of the green body in a vertical die buckling and pressing mode; b, after the middle octagon is formed, controlling the height of the flanges at the two ends through cushion blocks and forging the flanges to be rounded; c, finally, trimming the sizes of all parts of the forged piece into the designed sizes.

Description

technical field [0001] The invention relates to the field of valve body manufacturing, in particular to a valve body forging method. Background technique [0002] Valve products are widely used in petroleum, chemical industry, nuclear power, metallurgy, electric power, hydraulic power, large coal chemical industry and other industries. With the transfer of oil development to inland oilfields and offshore oilfields, and the development of the power industry from thermal power below 300,000 kilowatts to thermal power, hydropower and nuclear power above 300,000 kilowatts, valve products should also change their performance and performance according to changes in equipment application fields. parameter. Oil and gas transmission projects are developing towards pipelines, which requires a large number of flat gate valves and ball valves. The other side of energy development is energy saving, so from the perspective of energy saving, it is necessary to develop steam traps, and de...

AI Technical Summary

Problems solved by technology

Although this process ensures the mechanical properties and surface quality of the valve body, it still needs to be improved in terms of saving the material used for the valve body. The material saved is only 1.2%, and the process is relatively complicated and the manufacturing cycle is long.

[0006] The internal quality and performance of the valve body produced by the ordinary die forging process can meet the requirements of the working conditions, but it has high requirements for the mold. Under the current trend of saving energy and materials, the middle part of the ordinary die forging valve body is mostly square. Cannot meet the requirements of energy saving and consumption reduction

Moreover, the customer may need a relatively large valve body. It is difficult to use full die forging for a large valve body, and the manufacturing cost is relatively high.

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